pub fn dp_rec_mc(mut amount: u32) -> u32 {
    let denominations = [100, 50, 30, 20, 10, 5, 2, 1];
    let mut count = 0;
    for &coin in &denominations {
        while amount >= coin {
            amount -= coin;
            count += 1;
        }
    }

    count
}
